Results 251 to 260 of about 381,897 (285)

Equalization of Time Variant Multipath Channels Using Channel Estimation Based Classification Techniques

TENCON 2005 - 2005 IEEE Region 10 Conference, 2005
For the purpose of equalization of rapidly time variant multipath channels, we derive novel adaptation schemes based on the least mean square (LMS) algorithm. In two methods proposed in this paper, instead of a coefficient vector, a coefficient matrix is prepared for a linear transversal equalizer (LTE). Based on the estimated channel impulse response,
Yoshihiro Tsutsumi, Yusuke Tsuda, Tetsuya Shimamura   +2 more
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Simulation of a time-variant multipath channel

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94), 2002
A detailed knowledge of the characteristics of the time-variant and frequency-selective radio channel is fundamental to the development of new digital mobile and portable communication systems in the UHF-VHF band. Channel models have been derived from wideband propagation measurements of the mobile and portable radio channel.
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Channel estimation and equalization for OFDM system in sparse time-variant channel

2007 International Symposium on Intelligent Signal Processing and Communication Systems, 2007
Channel impulse response (CIR) is supposed to be second-order polynomial (SOP) variation within two neighboring blocks with each consisting of several OFDM symbols for ...
null Shu Feng, null Feng Xinxin, null Sun Jintao, null Cheng Shixin   +3 more
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Full Channel Correlation Matrix of a Time-Variant Wideband Spatial Channel Model

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, 2006
In this paper, the short-term time variation of wideband channels is investigated based on some extensions to the WINNER interim beyond-3G (IB3G) spatial channel model (SCM), using the full channel correlation matrix. These extensions mainly include some modifications of the generation of the wideband fast fading channel matrix, such as the ...
Hui Xiao, Alister Burr
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Joint channel estimation and equalization for fast time-variant multipath channels

The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2003
The paper presents a method for joint channel and data estimation for transmission over frequency-selective and time-variant channels. Hereby, fast time-variant channels can be tracked, which is important for mobile communications at very high velocities.
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A subspace-based channel model for frequency selective time variant MIMO channels

2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754), 2005
In this contribution we propose a subspace-based channel model suitable to represent frequency selective time variant MIMO channels. This approach captures the true nature of the MIMO channel maintaining the spatial correlation present between the antenna arrays. Correlation in time and frequency is conserved as well. The decomposition into eigenmodes,
G.D. Galdo, M. Haardt, M. Milojevic
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A simple Kalman channel Equalizer using adaptive algorithms for time variant channel

2011 International Conference on Signal Processing, Communication, Computing and Networking Technologies, 2011
In this paper, Discrete Kalman filter is used as an equalizer for digital transmission because it suppresses the noise and intersymbol interference (ISI). Kalman equalizer is based on the least square optimization criterion and its structure is made adaptive by combining it in parallel with adaptive algorithms to estimate the channel coefficients ...
Swati Katwal, Ravinder Nath, Govind Murmu   +2 more
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Time-variant channel equalization via discrete prolate spheroidal sequences

The Thrity-Seventh Asilomar Conference on Signals, Systems & Computers, 2003, 2004
In this work we present an equalization scheme for a multicarrier (MC) code division multiple access (CDMA) communication system that is operated in a frequency-selective time-variant (TV) channel. For block oriented data transmission we are interested to describe the TV channel for the duration of a data block with the smallest amount of parameters ...
T. Zemen, C.F. Mecklenbrauker
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An EM-based OFDM receiver for time-variant channels

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE, 2003
OFDM modulation combines the advantages of high achievable rates and relatively easy implementation. However, for proper recovery of the input, the receiver needs accurate channel information. In this paper, we propose an expectation-maximization (EM) algorithm for joint channel and data recovery.
T.Y. Al-Naffouri, A. Bahai, A. Paulraj
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User cooperation in wireless time-variant channels

2016
For wireless communications, the spectrum limitation and user mobility are two major challenges to promise reliable communications with high data rates and low latency. In order to improve spectral efficiency, future mobile systems employ full reuse of wireless spectrum, which makes interference management become a funda- mental prerequisite to cope ...
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